ICD-9-CM diagnosis code (retired)
987.7 — Toxic effect of hydrocyanic acid gas
About ICD-9-CM 987.7
987.7 is an ICD-9-CM diagnosis code for toxic effect of hydrocyanic acid gas. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 4 ICD-10-CM codes, such as T57.3X1A (Toxic effect of hydrogen cyanide, accidental (unintentional), initial encounter), T57.3X2A (Toxic effect of hydrogen cyanide, intentional self-harm, initial encounter) and T57.3X3A (Toxic effect of hydrogen cyanide, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T57.3X1AToxic effect of hydrogen cyanide, accidental (unintentional), initial encounterapproximate
- T57.3X2AToxic effect of hydrogen cyanide, intentional self-harm, initial encounterapproximate
- T57.3X3AToxic effect of hydrogen cyanide, assault, initial encounterapproximate
- T57.3X4AToxic effect of hydrogen cyanide, undetermined, initial encounterapproximate
Common questions about 987.7
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.